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Single-phase PWM rectifier for railway AC/DC/AC standby power supply

A backup power supply, AC-DC-AC technology, applied in the field of rectifiers, can solve the problems of DC bus midpoint potential deviation, increase the complexity of control algorithms, etc., and achieve the effects of small switching loss, reduced reactive power exchange, and high power factor

Inactive Publication Date: 2014-06-25
QINGDAO VECCON ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because both the ripple current and the unbalanced current flow into the split capacitor from the neutral line, resulting in the deviation of the midpoint potential of the DC bus, generally speaking, an additional midpoint balance algorithm is added, which increases the complexity of the control algorithm

Method used

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  • Single-phase PWM rectifier for railway AC/DC/AC standby power supply
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  • Single-phase PWM rectifier for railway AC/DC/AC standby power supply

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Embodiment Construction

[0017] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail;

[0018] Such as figure 1 , 2 As shown, a single-phase PWM rectifier for railway AC-DC-AC backup power supply includes a grid voltage 1, and also includes an input filter unit 2 electrically connected to the grid voltage 1, and the grid voltage 1 is connected with the grid voltage 1 through the input filter unit 2. The rectification unit 4 is electrically connected, and a pre-charging unit 3 for limiting excessive surge current during startup is electrically connected between the input filter unit 2 and the rectification unit 4 . The rectification unit 4 is electrically connected to the DC voltage support unit 5 connected with the load 8, and the inverter unit 6 for converting the line DC point into a regular 220V 50Hz AC output voltage is connected between the DC voltage support unit 5 and the load 8 . The rectification unit 4 is composed of t...

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Abstract

The invention discloses a single-phase PWM rectifier for a railway AC / DC / AC standby power supply. The single-phase PWM rectifier comprises network voltages and an input filter unit which is electrically connected with the network voltages. The network voltages are electrically connected with a rectification unit through the input filter unit. The rectification unit is electrically connected with a DC voltage supporting unit connected with a load. The rectification unit comprises two switch power machines which are connected in series. The two switch power machines which are connected in series are connected in parallel with the input filter unit. The DC voltage supporting unit comprises two sets of positive voltage capacitors which are connected in parallel and then are connected in series. The two sets of positive voltage capacitors are connected in parallel to the rectification unit. A novel single-phase PWM rectifier topological structure is provided, and under the situation that a middle point control algorithm is not added into an inversion side, DC bus middle point potential balance can still be kept. In addition, the structure has the advantages of being simple, reliable, low in switch loss, high in power factor and stable in DC voltage, and idle exchanging is lowered.

Description

technical field [0001] The invention belongs to the technical field of rectifiers, in particular to a single-phase PWM rectifier used for railway AC-DC backup power. Background technique [0002] The railway backup power supply provides electric energy for various forms of loads of railway vehicles and stations, such as air conditioning, ventilation, control systems, lighting, etc., and is an important guarantee for the safe and orderly operation of railways. With the continuous development of power electronics technology, AC-DC-AC converters have been widely used in railway systems. [0003] The railway backup power system mainly includes two parts: a rectifier and an inverter. First, the AC power of the grid is converted into DC power through the rectifier, and then the DC power is converted into AC power available for AC loads through the inverter. The rated voltage of AC loads in my country is single-phase AC220V and three-phase AC380V, so the inverter output generally ...

Claims

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Application Information

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IPC IPC(8): H02M7/25H02M5/458
Inventor 吕洪章
Owner QINGDAO VECCON ELECTRIC
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